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He called gay marriage in the 1972 movie 'Future Shock' when homosexuality was still listed as a mental illness

Never knew there was a movie.

https://www.youtube.com/watch?v=vVJrJk3q3MA

(Now that's the thing that no one could predict in 1970. That one day you would be able to summon up a movie with a few keystrokes.)

You'll find that concept in Arthur C. Clarke's Imperial Earth, published in 1975, and written a during the years earlier. (It draws strongly on OPEC, the 1973 oil embargo, Nixon, and petrodollars.)

Joe Haldeman's "The Forever War" from 1974 also touches on this.

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